sedimentary

Rounded sandstone pebble

Sandstone, predominantly quartz with feldspar and iron-oxide cement

AI-generated identification · may be incorrect

Fine-grained, tan to brown, dull to earthy luster, with a smooth water-worn surface; hardness about 6–7 for quartz grains, but overall cohesion is variable. No visible crystals or strong cleavage; the pale patch may be weathered cement or a lighter clast.

Identified August 26, 2026More sedimentary →

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Physical properties

Formation & geological history

Likely lithified sand deposited in a river, beach, dune, or shallow-marine setting, then rounded by transport; iron oxides produce the brown color. The image cannot establish a precise geological age.

Uses & applications

Used as building and paving stone, aggregate, landscaping material, and occasionally as a decorative or teaching specimen; this pebble has little jewelry value.

Geological facts

Sandstone can preserve cross-bedding, ripple marks, fossils, and ancient environmental clues, though none are clearly visible here.

Field identification & locations

Identify by its gritty texture, visible sand grains, uneven porosity, and reaction generally absent with dilute acid; a steel nail may scratch weakly cemented examples. Common worldwide, especially in streambeds and sedimentary basins.